John Negroponte, a veteran diplomat who served under three Republican administrations as well as the Clinton administration, endorsed Hillary Clinton for president on Wednesday. In a statement provided by the Clinton campaign, Negroponte touted the former secretary of state’s “leadership qualities” in his decision. “She will bring to the Presidency the skill, experience and wisdom that is needed in a President and Commander in Chief,” he said. “Having myself served in numerous diplomatic and national security positions starting in 1960, I am convinced that Secretary Clinton has the leadership qualities that far and away qualify her best to be our...